aboutsummaryrefslogtreecommitdiffhomepage
path: root/dvdread/dvd_reader.c
blob: 49140544e4e3797352c0d468529c20cd730e8b09 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
/* -*- c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 * Copyright (C) 2001, 2002, 2003 Billy Biggs <vektor@dumbterm.net>,
 *                                Håkan Hjort <d95hjort@dtek.chalmers.se>,
 *                                Björn Englund <d4bjorn@dtek.chalmers.se>
 *
 * Modified for use with MPlayer, changes contained in libdvdread_changes.diff.
 * detailed changelog at http://svn.mplayerhq.hu/mplayer/trunk/
 * $Id$
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 */

#include "config.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h> /* For the timing of dvdcss_title crack. */
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <dirent.h>
 
#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__bsdi__) || defined(__DARWIN__) || defined(__DragonFly__)
#define SYS_BSD 1
#endif

#if defined(__sun)
#include <sys/mnttab.h>
#elif defined(hpux)
#include </usr/conf/h/mnttab.h>
#elif defined(SYS_BSD)
#include <fstab.h>
#elif defined(__linux__) || defined(__CYGWIN__)
#include <mntent.h>
#endif

#include "dvd_reader.h"
#include "dvd_input.h"
#include "dvd_udf.h"
#include "md5.h"

#include "dvdread_internal.h"

#define DEFAULT_UDF_CACHE_LEVEL 0

struct dvd_reader_s {
  /* Basic information. */
  int isImageFile;
  
  /* Hack for keeping track of the css status. 
   * 0: no css, 1: perhaps (need init of keys), 2: have done init */
  int css_state;
  int css_title; /* Last title that we have called dvdinpute_title for. */

  /* Information required for an image file. */
  dvd_input_t dev;

  /* Information required for a directory path drive. */
  char *path_root;
  
  /* Filesystem cache */
  int udfcache_level; /* 0 - turned off, 1 - on */
  void *udfcache;

  /* block aligned malloc */
  void *align;
  
  /* error message verbosity level */
  int verbose;
};

struct dvd_file_s {
  /* Basic information. */
  dvd_reader_t *dvd;
  
  /* Hack for selecting the right css title. */
  int css_title;

  /* Information required for an image file. */
  uint32_t lb_start;
  uint32_t seek_pos;

  /* Information required for a directory path drive. */
  size_t title_sizes[ 9 ];
  dvd_input_t title_devs[ 9 ];

  /* Calculated at open-time, size in blocks. */
  ssize_t filesize;
};


#define DVDREAD_VERBOSE_DEFAULT 0

int get_verbose(void)
{
  char *dvdread_verbose;
  int verbose;
  
  dvdread_verbose = getenv("DVDREAD_VERBOSE");
  if(dvdread_verbose) {
    verbose = (int)strtol(dvdread_verbose, NULL, 0);
  } else {
    verbose = DVDREAD_VERBOSE_DEFAULT;
  }
  return verbose;
}

int dvdread_verbose(dvd_reader_t *dvd)
{
  return dvd->verbose;
}

dvd_reader_t *device_of_file(dvd_file_t *file)
{
  return file->dvd;
}

/**
 * Returns the compiled version. (DVDREAD_VERSION as an int)
 */
int DVDVersion(void)
{
  return DVDREAD_VERSION;
}


/**
 * Set the level of caching on udf
 * level = 0 (no caching)
 * level = 1 (caching filesystem info)
 */
int DVDUDFCacheLevel(dvd_reader_t *device, int level)
{
  struct dvd_reader_s *dev = (struct dvd_reader_s *)device;
  
  if(level > 0) {
    level = 1;
  } else if(level < 0) {
    return dev->udfcache_level;
  }

  dev->udfcache_level = level;
  
  return level;
}

void *GetUDFCacheHandle(dvd_reader_t *device)
{
  struct dvd_reader_s *dev = (struct dvd_reader_s *)device;
  
  return dev->udfcache;
}

void SetUDFCacheHandle(dvd_reader_t *device, void *cache)
{
  struct dvd_reader_s *dev = (struct dvd_reader_s *)device;

  dev->udfcache = cache;
}

void *GetAlignHandle(dvd_reader_t *device)
{
  struct dvd_reader_s *dev = (struct dvd_reader_s *)device;
  
  return dev->align;
}

void SetAlignHandle(dvd_reader_t *device, void *align)
{
  struct dvd_reader_s *dev = (struct dvd_reader_s *)device;

  dev->align = align;
}


/* Loop over all titles and call dvdcss_title to crack the keys. */
static int initAllCSSKeys( dvd_reader_t *dvd )
{
  struct timeval all_s, all_e;
  struct timeval t_s, t_e;
  char filename[ MAX_UDF_FILE_NAME_LEN ];
  uint32_t start, len;
  int title;
        
  char *nokeys_str = getenv("DVDREAD_NOKEYS");
  if(nokeys_str != NULL)
    return 0;
    
  if(dvd->verbose >= 1) {
    fprintf( stderr, "\n" );
    fprintf( stderr, "libdvdread: Attempting to retrieve all CSS keys\n" );
    fprintf( stderr, "libdvdread: This can take a _long_ time, "
             "please be patient\n\n" );
  }
  gettimeofday(&all_s, NULL);
        
  for( title = 0; title < 100; title++ ) {
    gettimeofday( &t_s, NULL );
    if( title == 0 ) {
      sprintf( filename, "/VIDEO_TS/VIDEO_TS.VOB" );
    } else {
      sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, 0 );
    }
    start = UDFFindFile( dvd, filename, &len );
    if( start != 0 && len != 0 ) {
      /* Perform CSS key cracking for this title. */
      if(dvd->verbose >= 1) {
        fprintf( stderr, "libdvdread: Get key for %s at 0x%08x\n", 
                 filename, start );
      }
      if( dvdinput_title( dvd->dev, (int)start ) < 0 ) {
        if(dvd->verbose >= 0) {
          fprintf( stderr, "libdvdread: Error cracking CSS key for %s (0x%08x)\n", filename, start);
        }
      }
      gettimeofday( &t_e, NULL );
      if(dvd->verbose >= 1) {
        fprintf( stderr, "libdvdread: Elapsed time %ld\n",  
                 (long int) t_e.tv_sec - t_s.tv_sec );
      }
    }
            
    if( title == 0 ) continue;
            
    gettimeofday( &t_s, NULL );
    sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, 1 );
    start = UDFFindFile( dvd, filename, &len );
    if( start == 0 || len == 0 ) break;
            
    /* Perform CSS key cracking for this title. */
    if(dvd->verbose >= 1) {
      fprintf( stderr, "libdvdread: Get key for %s at 0x%08x\n", 
               filename, start );
    }
    if( dvdinput_title( dvd->dev, (int)start ) < 0 ) {
      if(dvd->verbose >= 0) {
        fprintf( stderr, "libdvdread: Error cracking CSS key for %s (0x%08x)!!\n", filename, start);
      }
    }
    gettimeofday( &t_e, NULL );
    if(dvd->verbose >= 1) {
      fprintf( stderr, "libdvdread: Elapsed time %ld\n",  
               (long int) t_e.tv_sec - t_s.tv_sec );
    }
  }
  title--;
    
  if(dvd->verbose >= 1) {
    fprintf( stderr, "libdvdread: Found %d VTS's\n", title );
  }
  gettimeofday(&all_e, NULL);
  if(dvd->verbose >= 1) {
    fprintf( stderr, "libdvdread: Elapsed time %ld\n",  
             (long int) all_e.tv_sec - all_s.tv_sec );
  }
  return 0;
}



/**
 * Open a DVD image or block device file.
 * Checks if the root directory in the udf image file can be found.
 * If not it assumes this isn't a valid udf image and returns NULL
 */
static dvd_reader_t *DVDOpenImageFile( const char *location, int have_css )
{
  dvd_reader_t *dvd;
  dvd_input_t dev;
  int verbose;

  verbose = get_verbose();

  dev = dvdinput_open( location );
  if( !dev ) {
    if(verbose >= 1) {
      fprintf( stderr, "libdvdread: Can't open '%s' for reading: %s\n",
               location, strerror(errno));
    }
    return NULL;
  }

  dvd = (dvd_reader_t *) malloc( sizeof( dvd_reader_t ) );
  if( !dvd ) {
    int tmp_errno = errno;
    dvdinput_close(dev);
    errno = tmp_errno;
    return NULL;
  }
  dvd->verbose = verbose;
  dvd->isImageFile = 1;
  dvd->dev = dev;
  dvd->path_root = NULL;
    
  dvd->udfcache_level = DEFAULT_UDF_CACHE_LEVEL;
  dvd->udfcache = NULL;

  dvd->align = NULL;

  if( have_css ) {
    /* Only if DVDCSS_METHOD = title, a bit if it's disc or if
     * DVDCSS_METHOD = key but region missmatch. Unfortunaly we
     * don't have that information. */
    
    dvd->css_state = 1; /* Need key init. */
  }
  dvd->css_title = 0;
  
  /* sanity check, is it a valid UDF image, can we find the root dir */
  if(!UDFFindFile(dvd, "/", NULL)) {
    dvdinput_close(dvd->dev);
    if(dvd->udfcache) {
      FreeUDFCache(dvd, dvd->udfcache);
    }
    if(dvd->align) {
      if(dvd->verbose >= 0) {
        fprintf(stderr, "libdvdread: DVDOpenImageFile(): Memory leak in align functions 1\n");
      }
    }
    free(dvd);
    return NULL;
  }
  return dvd;
}

static dvd_reader_t *DVDOpenPath( const char *path_root )
{
  dvd_reader_t *dvd;

  dvd = (dvd_reader_t *) malloc( sizeof( dvd_reader_t ) );
  if( !dvd ) {
    return NULL;
  }
  dvd->verbose = get_verbose();
  dvd->isImageFile = 0;
  dvd->dev = 0;
  dvd->path_root = strdup( path_root );
  if(!dvd->path_root) {
    free(dvd);
    return 0;
  }
  dvd->udfcache_level = DEFAULT_UDF_CACHE_LEVEL;
  dvd->udfcache = NULL;

  dvd->align = NULL;

  dvd->css_state = 0; /* Only used in the UDF path */
  dvd->css_title = 0; /* Only matters in the UDF path */

  return dvd;
}

#if defined(__sun)
/* /dev/rdsk/c0t6d0s0 (link to /devices/...)
   /vol/dev/rdsk/c0t6d0/??
   /vol/rdsk/<name> */
static char *sun_block2char( const char *path )
{
  char *new_path;

  /* Must contain "/dsk/" */ 
  if( !strstr( path, "/dsk/" ) ) return (char *) strdup( path );

  /* Replace "/dsk/" with "/rdsk/" */
  new_path = malloc( strlen(path) + 2 );
  strcpy( new_path, path );
  strcpy( strstr( new_path, "/dsk/" ), "" );
  strcat( new_path, "/rdsk/" );
  strcat( new_path, strstr( path, "/dsk/" ) + strlen( "/dsk/" ) );

  return new_path;
}
#endif

#if defined(SYS_BSD)
/* FreeBSD /dev/(r)(a)cd0c (a is for atapi), recomended to _not_ use r
   update: FreeBSD and DragonFly no longer uses the prefix so don't add it.

   OpenBSD /dev/rcd0c, it needs to be the raw device
   NetBSD  /dev/rcd0[d|c|..] d for x86, c (for non x86), perhaps others
   Darwin  /dev/rdisk0,  it needs to be the raw device
   BSD/OS  /dev/sr0c (if not mounted) or /dev/rsr0c ('c' any letter will do)
   
   returns a string allocated with strdup which should be free()'d when
   no longer used.
*/
static char *bsd_block2char( const char *path )
{
#if defined(__FreeBSD__) || defined(__DragonFly__)
  return (char *) strdup( path );
#else
  char *new_path;

  /* If it doesn't start with "/dev/" or does start with "/dev/r" exit */ 
  if( strncmp( path, "/dev/",  5 ) || !strncmp( path, "/dev/r", 6 ) ) 
    return (char *) strdup( path );

  /* Replace "/dev/" with "/dev/r" */
  new_path = malloc( strlen(path) + 2 );
  strcpy( new_path, "/dev/r" );
  strcat( new_path, path + strlen( "/dev/" ) );

  return new_path;
#endif /* __FreeBSD__ || __DragonFly__ */
}
#endif


dvd_reader_t *DVDOpen( const char *path )
{
  struct stat fileinfo;
  int ret, have_css;
  char *dev_name = NULL;
  int internal_errno = 0;
  int verbose;

  if( path == NULL ) {
    errno = EINVAL;
    return NULL;
  }
  
  verbose = get_verbose();

#ifdef WIN32
  /* Stat doesn't work on devices under mingwin/cygwin. */
  if( path[0] && path[1] == ':' && path[2] == '\0' )
    {
      /* Don't try to stat the file */
      fileinfo.st_mode = S_IFBLK;
    }
  else
#endif
    {
      ret = stat( path, &fileinfo );
      if( ret < 0 ) {
        int tmp_errno = errno;
        /* If we can't stat the file, give up */
        if(verbose >= 1) {
          fprintf( stderr, "libdvdread: Can't stat '%s': %s\n",
                   path, strerror(errno));
        }
        errno = tmp_errno;
        return NULL;
      }
    }

  /* Try to open libdvdcss or fall back to standard functions */
  have_css = dvdinput_setup();

  /* First check if this is a block/char device or a file*/
  if( S_ISBLK( fileinfo.st_mode ) || 
      S_ISCHR( fileinfo.st_mode ) || 
      S_ISREG( fileinfo.st_mode ) ) {
    /**
     * Block devices and regular files are assumed to be DVD-Video images.
     */
    dvd_reader_t *dvd = NULL;
#if defined(__sun)
    dev_name = sun_block2char( path );
#elif defined(SYS_BSD)
    dev_name = bsd_block2char( path );
#else
    dev_name = strdup( path );
#endif
    dvd = DVDOpenImageFile( dev_name, have_css );
    free( dev_name );
    
    return dvd;
  } else if( S_ISDIR( fileinfo.st_mode ) ) {
    dvd_reader_t *auth_drive = 0;
    char *path_copy;
#if defined(SYS_BSD)
    struct fstab* fe;
#elif defined(__sun) || defined(__linux__) || defined(__CYGWIN__)
    FILE *mntfile;
#endif

    /* XXX: We should scream real loud here. */
    if( !(path_copy = strdup( path ) ) ) return 0;

#ifndef WIN32 /* don't have fchdir, and getcwd( NULL, ... ) is strange */
    /* Resolve any symlinks and get the absolut dir name. */
    {
      char *new_path;
      char *current_path;

      current_path = malloc(PATH_MAX);
      if(current_path) {
        if(!getcwd(current_path, PATH_MAX)) {
          free(current_path);
          current_path = NULL;
        }
      }
      if(current_path) {
        chdir( path_copy );
        new_path = malloc(PATH_MAX);
        if(new_path) {
          if(!getcwd(new_path, PATH_MAX )) {
            free(new_path);
            new_path = NULL;
          }
        }

        chdir(current_path);
        free(current_path);
        if( new_path ) {
          free( path_copy );
          path_copy = new_path;
        }
      }
    }
#endif
        
    /**
     * If we're being asked to open a directory, check if that directory
     * is the mountpoint for a DVD-ROM which we can use instead.
     */

    if( strlen( path_copy ) > 1 ) {
      if( path_copy[ strlen( path_copy ) - 1 ] == '/' ) {
        path_copy[ strlen( path_copy ) - 1 ] = '\0';
      }
    }

    if( strlen( path_copy ) >= 9 ) {
      if( !strcasecmp( &(path_copy[ strlen( path_copy ) - 9 ]), 
                       "/video_ts" ) ) {
        path_copy[ strlen( path_copy ) - 9 ] = '\0';
        if(path_copy[0] == '\0') {
          path_copy[0] = '/';
          path_copy[1] = '\0';
        }
      }
    }

#if defined(SYS_BSD)
    if( ( fe = getfsfile( path_copy ) ) ) {
      dev_name = bsd_block2char( fe->fs_spec );
      if(verbose >= 1) {
        fprintf( stderr,
                 "libdvdread: Attempting to use device %s"
                 " mounted on %s%s\n",
                 dev_name,
                 fe->fs_file,
                 have_css ? " for CSS authentication" : "");
      }
      auth_drive = DVDOpenImageFile( dev_name, have_css );
      if(!auth_drive) {
        internal_errno = errno;
      }
    }
#elif defined(__sun)
    mntfile = fopen( MNTTAB, "r" );
    if( mntfile ) {
      struct mnttab mp;
      int res;
      
      while( ( res = getmntent( mntfile, &mp ) ) != -1 ) {
        if( res == 0 && !strcmp( mp.mnt_mountp, path_copy ) ) {
          dev_name = sun_block2char( mp.mnt_special );
          if(verbose >= 1) {
            fprintf( stderr, 
                     "libdvdread: Attempting to use device %s"
                     " mounted on %s%s\n",
                     dev_name,
                     mp.mnt_mountp,
                     have_css ? " for CSS authentication" : "");
          }
          auth_drive = DVDOpenImageFile( dev_name, have_css );
          if(!auth_drive) {
            internal_errno = errno;
          }
          break;
        }
      }
      fclose( mntfile );
    }
#elif defined(__linux__) || defined(__CYGWIN__)
    mntfile = fopen( MOUNTED, "r" );
    if( mntfile ) {
      struct mntent *me;
 
      while( ( me = getmntent( mntfile ) ) ) {
        if( !strcmp( me->mnt_dir, path_copy ) ) {
          if(verbose >= 1) {
            fprintf( stderr, 
                     "libdvdread: Attempting to use device %s"
                     " mounted on %s%s\n",
                     me->mnt_fsname,
                     me->mnt_dir,
                     have_css ? " for CSS authentication" : "");
          }
          auth_drive = DVDOpenImageFile( me->mnt_fsname, have_css );
          if(!auth_drive) {
            internal_errno = errno;
          }
          dev_name = strdup(me->mnt_fsname);
          break;
        }
      }
      fclose( mntfile );
    }
#elif defined(__MINGW32__)
    dev_name = strdup(path);
    auth_drive = DVDOpenImageFile( path, have_css );
#endif
    if( !dev_name ) {
      if(verbose >= 1) {
        fprintf( stderr, "libdvdread: Couldn't find device name.\n" );
      }
    } else if( !auth_drive ) {
      if(verbose >= 1) {
        fprintf( stderr, "libdvdread: Device %s inaccessible%s: %s\n",
                 dev_name,
                 have_css ? ", CSS authentication not available" : "",
                 strerror(internal_errno));
      }
    }

    free( dev_name );
    free( path_copy );

    /**
     * If we've opened a drive, just use that.
     */
    if( auth_drive ) {
      return auth_drive;
    }
    /**
     * Otherwise, we now try to open the directory tree instead.
     */
    return DVDOpenPath( path );
  }

  /* If it's none of the above, screw it. */
  if(verbose >= 1) {
    fprintf( stderr, "libdvdread: Could not open %s\n", path );
  }
  return 0;
}

void DVDClose( dvd_reader_t *dvd )
{
  if( dvd ) {
    if( dvd->dev ) dvdinput_close( dvd->dev );
    if( dvd->path_root ) free( dvd->path_root );
    if( dvd->udfcache ) FreeUDFCache( dvd, dvd->udfcache );
    if(dvd->align) {
      if(dvd->verbose >= 0) {
        fprintf(stderr, "libdvdread: DVDClose(): Memory leak in align functions\n");
      }
    }

    free( dvd );
  }
}

void DVDInit(void)
{
  dvdinput_setup();
}

void DVDFinish(void)
{
  dvdinput_free();
}

/**
 * Open an unencrypted file on a DVD image file.
 */
static dvd_file_t *DVDOpenFileUDF( dvd_reader_t *dvd, char *filename )
{
  uint32_t start, len;
  dvd_file_t *dvd_file;

  start = UDFFindFile( dvd, filename, &len );
  if( !start ) return 0;

  dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
  if( !dvd_file ) return 0;
  dvd_file->dvd = dvd;
  dvd_file->lb_start = start;
  dvd_file->seek_pos = 0;
  memset( dvd_file->title_sizes, 0, sizeof( dvd_file->title_sizes ) );
  memset( dvd_file->title_devs, 0, sizeof( dvd_file->title_devs ) );
  dvd_file->filesize = len / DVD_VIDEO_LB_LEN;

  return dvd_file;
}

/**
 * Searches for <file> in directory <path>, ignoring case.
 * Returns 0 and full filename in <filename>.
 *     or -1 on file not found.
 *     or -2 on path not found.
 */
static int findDirFile( const char *path, const char *file, char *filename ) 
{
  DIR *dir;
  struct dirent *ent;

  dir = opendir( path );
  if( !dir ) return -2;

  while( ( ent = readdir( dir ) ) != NULL ) {
    if( !strcasecmp( ent->d_name, file ) ) {
      sprintf( filename, "%s%s%s", path,
               ( ( path[ strlen( path ) - 1 ] == '/' ) ? "" : "/" ),
               ent->d_name );
      closedir(dir);
      return 0;
    }
  }
  closedir(dir);
  return -1;
}

static int findDVDFile( dvd_reader_t *dvd, const char *file, char *filename )
{
  char video_path[ PATH_MAX + 1 ];
  const char *nodirfile;
  int ret;

  /* Strip off the directory for our search */
  if( !strncasecmp( "/VIDEO_TS/", file, 10 ) ) {
    nodirfile = &(file[ 10 ]);
  } else {
    nodirfile = file;
  }

  ret = findDirFile( dvd->path_root, nodirfile, filename );
  if( ret < 0 ) {
    /* Try also with adding the path, just in case. */
    sprintf( video_path, "%s/VIDEO_TS/", dvd->path_root );
    ret = findDirFile( video_path, nodirfile, filename );
    if( ret < 0 ) {
      /* Try with the path, but in lower case. */
      sprintf( video_path, "%s/video_ts/", dvd->path_root );
      ret = findDirFile( video_path, nodirfile, filename );
      if( ret < 0 ) {
        return 0;
      }
    }
  }

  return 1;
}

/**
 * Open an unencrypted file from a DVD directory tree.
 */
static dvd_file_t *DVDOpenFilePath( dvd_reader_t *dvd, char *filename )
{
  char full_path[ PATH_MAX + 1 ];
  dvd_file_t *dvd_file;
  struct stat fileinfo;
  dvd_input_t dev;

  /* Get the full path of the file. */
  if( !findDVDFile( dvd, filename, full_path ) ) return 0;

  dev = dvdinput_open( full_path );
  if( !dev ) return 0;

  dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
  if( !dvd_file ) return 0;
  dvd_file->dvd = dvd;
  dvd_file->lb_start = 0;
  dvd_file->seek_pos = 0;
  memset( dvd_file->title_sizes, 0, sizeof( dvd_file->title_sizes ) );
  memset( dvd_file->title_devs, 0, sizeof( dvd_file->title_devs ) );
  dvd_file->filesize = 0;

  if( stat( full_path, &fileinfo ) < 0 ) {
    if(dvd->verbose >= 1) {
      fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
    }
    free( dvd_file );
    return 0;
  }
  dvd_file->title_sizes[ 0 ] = fileinfo.st_size / DVD_VIDEO_LB_LEN;
  dvd_file->title_devs[ 0 ] = dev;
  dvd_file->filesize = dvd_file->title_sizes[ 0 ];

  return dvd_file;
}

static dvd_file_t *DVDOpenVOBUDF( dvd_reader_t *dvd, int title, int menu )
{
  char filename[ MAX_UDF_FILE_NAME_LEN ];
  uint32_t start, len;
  dvd_file_t *dvd_file;

  if( title == 0 ) {
    sprintf( filename, "/VIDEO_TS/VIDEO_TS.VOB" );
  } else {
    sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, menu ? 0 : 1 );
  }
  start = UDFFindFile( dvd, filename, &len );
  if( start == 0 ) return 0;

  dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
  if( !dvd_file ) return 0;
  dvd_file->dvd = dvd;
  /*Hack*/ dvd_file->css_title = title << 1 | menu;
  dvd_file->lb_start = start;
  dvd_file->seek_pos = 0;
  memset( dvd_file->title_sizes, 0, sizeof( dvd_file->title_sizes ) );
  memset( dvd_file->title_devs, 0, sizeof( dvd_file->title_devs ) );
  dvd_file->filesize = len / DVD_VIDEO_LB_LEN;

  /* Calculate the complete file size for every file in the VOBS */
  if( !menu ) {
    int cur;

    for( cur = 2; cur < 10; cur++ ) {
      sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, cur );
      if( !UDFFindFile( dvd, filename, &len ) ) break;
      dvd_file->filesize += len / DVD_VIDEO_LB_LEN;
    }
  }
    
  if( dvd->css_state == 1 /* Need key init */ ) {
//    initAllCSSKeys( dvd );
//    dvd->css_state = 2;
  }
  /*    
        if( dvdinput_title( dvd_file->dvd->dev, (int)start ) < 0 ) {
        fprintf( stderr, "libdvdread: Error cracking CSS key for %s\n",
        filename );
        }
  */
    
  return dvd_file;
}

static dvd_file_t *DVDOpenVOBPath( dvd_reader_t *dvd, int title, int menu )
{
  char filename[ MAX_UDF_FILE_NAME_LEN ];
  char full_path[ PATH_MAX + 1 ];
  struct stat fileinfo;
  dvd_file_t *dvd_file;
  int i;

  dvd_file = (dvd_file_t *) malloc( sizeof( dvd_file_t ) );
  if( !dvd_file ) return 0;
  dvd_file->dvd = dvd;
  /*Hack*/ dvd_file->css_title = title << 1 | menu;
  dvd_file->lb_start = 0;
  dvd_file->seek_pos = 0;
  memset( dvd_file->title_sizes, 0, sizeof( dvd_file->title_sizes ) );
  memset( dvd_file->title_devs, 0, sizeof( dvd_file->title_devs ) );
  dvd_file->filesize = 0;
    
  if( menu ) {
    dvd_input_t dev;

    if( title == 0 ) {
      sprintf( filename, "VIDEO_TS.VOB" );
    } else {
      sprintf( filename, "VTS_%02i_0.VOB", title );
    }
    if( !findDVDFile( dvd, filename, full_path ) ) {
      free( dvd_file );
      return 0;
    }

    dev = dvdinput_open( full_path );
    if( dev == NULL ) {
      free( dvd_file );
      return 0;
    }

    if( stat( full_path, &fileinfo ) < 0 ) {
      if(dvd->verbose >= 1) {
        fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
      }
      free( dvd_file );
      return 0;
    }
    dvd_file->title_sizes[ 0 ] = fileinfo.st_size / DVD_VIDEO_LB_LEN;
    dvd_file->title_devs[ 0 ] = dev;
    dvdinput_title( dvd_file->title_devs[0], 0);
    dvd_file->filesize = dvd_file->title_sizes[ 0 ];

  } else {
    for( i = 0; i < 9; ++i ) {

      sprintf( filename, "VTS_%02i_%i.VOB", title, i + 1 );
      if( !findDVDFile( dvd, filename, full_path ) ) {
        break;
      }

      if( stat( full_path, &fileinfo ) < 0 ) {
        if(dvd->verbose >= 1) {
          fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
        }
        break;
      }

      dvd_file->title_sizes[ i ] = fileinfo.st_size / DVD_VIDEO_LB_LEN;
      dvd_file->title_devs[ i ] = dvdinput_open( full_path );
      dvdinput_title( dvd_file->title_devs[ i ], 0 );
      dvd_file->filesize += dvd_file->title_sizes[ i ];
    }
    if( !dvd_file->title_devs[ 0 ] ) {
      free( dvd_file );
      return 0;
    }
  }

  return dvd_file;
}

dvd_file_t *DVDOpenFile( dvd_reader_t *dvd, int titlenum, 
                         dvd_read_domain_t domain )
{
  char filename[ MAX_UDF_FILE_NAME_LEN ];
    
  /* Check arguments. */
  if( dvd == NULL || titlenum < 0 ) {
    errno = EINVAL;
    return NULL;
  }

  switch( domain ) {
  case DVD_READ_INFO_FILE:
    if( titlenum == 0 ) {
      sprintf( filename, "/VIDEO_TS/VIDEO_TS.IFO" );
    } else {
      sprintf( filename, "/VIDEO_TS/VTS_%02i_0.IFO", titlenum );
    }
    break;
  case DVD_READ_INFO_BACKUP_FILE:
    if( titlenum == 0 ) {
      sprintf( filename, "/VIDEO_TS/VIDEO_TS.BUP" );
    } else {
      sprintf( filename, "/VIDEO_TS/VTS_%02i_0.BUP", titlenum );
    }
    break;
  case DVD_READ_MENU_VOBS:
    if( dvd->isImageFile ) {
      return DVDOpenVOBUDF( dvd, titlenum, 1 );
    } else {
      return DVDOpenVOBPath( dvd, titlenum, 1 );
    }
    break;
  case DVD_READ_TITLE_VOBS:
    if( titlenum == 0 ) return 0;
    if( dvd->isImageFile ) {
      return DVDOpenVOBUDF( dvd, titlenum, 0 );
    } else {
      return DVDOpenVOBPath( dvd, titlenum, 0 );
    }
    break;
  default:
    if(dvd->verbose >= 1) {
      fprintf( stderr, "libdvdread: Invalid domain for file open.\n" );
    }
    errno = EINVAL;
    return NULL;
  }
    
  if( dvd->isImageFile ) {
    return DVDOpenFileUDF( dvd, filename );
  } else {
    return DVDOpenFilePath( dvd, filename );
  }
}

void DVDCloseFile( dvd_file_t *dvd_file )
{
  int i;

  if( dvd_file ) {
    if( dvd_file->dvd->isImageFile ) {
      ;
    } else {
      for( i = 0; i < 9; ++i ) {
        if( dvd_file->title_devs[ i ] ) {
          dvdinput_close( dvd_file->title_devs[i] );
        }
      }
    }

    free( dvd_file );
    dvd_file = 0;
  }
}

static int DVDFileStatVOBUDF(dvd_reader_t *dvd, int title, 
                             int menu, dvd_stat_t *statbuf)
{
  char filename[ MAX_UDF_FILE_NAME_LEN ];
  uint32_t size;
  off_t tot_size;
  off_t parts_size[9];
  int nr_parts = 0;
  int n;
 
  if( title == 0 ) {
    sprintf( filename, "/VIDEO_TS/VIDEO_TS.VOB" );
  } else {
    sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, menu ? 0 : 1 );
  }
  if(!UDFFindFile( dvd, filename, &size )) {
    return -1;
  }
  tot_size = size;
  nr_parts = 1;
  parts_size[0] = size;

  if( !menu ) {
    int cur;

    for( cur = 2; cur < 10; cur++ ) {
      sprintf( filename, "/VIDEO_TS/VTS_%02d_%d.VOB", title, cur );
      if( !UDFFindFile( dvd, filename, &size ) ) {
        break;
      }
      parts_size[nr_parts] = size;
      tot_size += size;
      nr_parts++;
    }
  }
  
  statbuf->size = tot_size;
  statbuf->nr_parts = nr_parts;
  for(n = 0; n < nr_parts; n++) {
    statbuf->parts_size[n] = parts_size[n];
  }
  return 0;
}


static int DVDFileStatVOBPath( dvd_reader_t *dvd, int title,
                                       int menu, dvd_stat_t *statbuf )
{
  char filename[ MAX_UDF_FILE_NAME_LEN ];
  char full_path[ PATH_MAX + 1 ];
  struct stat fileinfo;
  off_t tot_size;
  off_t parts_size[9];
  int nr_parts = 0;
  int n;

 
    
  if( title == 0 ) {
    sprintf( filename, "VIDEO_TS.VOB" );
  } else {
    sprintf( filename, "VTS_%02d_%d.VOB", title, menu ? 0 : 1 );
  }
  if( !findDVDFile( dvd, filename, full_path ) ) {
    return -1;
  }
  
  if( stat( full_path, &fileinfo ) < 0 ) {
    if(dvd->verbose >= 1) {
      fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
    }
    return -1;
  }
  

  tot_size = fileinfo.st_size;
  nr_parts = 1;
  parts_size[0] = fileinfo.st_size;

  if( !menu ) {
    int cur;
    
    for( cur = 2; cur < 10; cur++ ) {

      sprintf( filename, "VTS_%02d_%d.VOB", title, cur );
      if( !findDVDFile( dvd, filename, full_path ) ) {
        break;
      }

      if( stat( full_path, &fileinfo ) < 0 ) {
        if(dvd->verbose >= 1) {
          fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
        }
        break;
      }
      
      parts_size[nr_parts] = fileinfo.st_size;
      tot_size += parts_size[nr_parts];
      nr_parts++;
    }
  }

  statbuf->size = tot_size;
  statbuf->nr_parts = nr_parts;
  for(n = 0; n < nr_parts; n++) {
    statbuf->parts_size[n] = parts_size[n];
  }
  return 0;
}


int DVDFileStat(dvd_reader_t *dvd, int titlenum, 
                dvd_read_domain_t domain, dvd_stat_t *statbuf)
{
  char filename[ MAX_UDF_FILE_NAME_LEN ];
  char full_path[ PATH_MAX + 1 ];
  struct stat fileinfo;
  uint32_t size;

  /* Check arguments. */
  if( dvd == NULL || titlenum < 0 ) {
    errno = EINVAL;
    return -1;
  }

  switch( domain ) {
  case DVD_READ_INFO_FILE:
    if( titlenum == 0 ) {
      sprintf( filename, "/VIDEO_TS/VIDEO_TS.IFO" );
    } else {
      sprintf( filename, "/VIDEO_TS/VTS_%02i_0.IFO", titlenum );
    }
    break;
  case DVD_READ_INFO_BACKUP_FILE:
    if( titlenum == 0 ) {
      sprintf( filename, "/VIDEO_TS/VIDEO_TS.BUP" );
    } else {
      sprintf( filename, "/VIDEO_TS/VTS_%02i_0.BUP", titlenum );
    }
    break;
  case DVD_READ_MENU_VOBS:
    if( dvd->isImageFile ) {
      return DVDFileStatVOBUDF( dvd, titlenum, 1, statbuf );
    } else {
      return DVDFileStatVOBPath( dvd, titlenum, 1, statbuf );
    }
    break;
  case DVD_READ_TITLE_VOBS:
    if( titlenum == 0 ) {
      return -1;
    }
    if( dvd->isImageFile ) {
      return DVDFileStatVOBUDF( dvd, titlenum, 0, statbuf );
    } else {
      return DVDFileStatVOBPath( dvd, titlenum, 0, statbuf );
    }
    break;
  default:
    if(dvd->verbose >= 1) {
      fprintf( stderr, "libdvdread: Invalid domain for file stat.\n" );
    }
    errno = EINVAL;
    return -1;
  }
  
  if( dvd->isImageFile ) {
    if( UDFFindFile( dvd, filename, &size ) ) {
      statbuf->size = size;
      statbuf->nr_parts = 1;
      statbuf->parts_size[0] = size;
      return 0;
    }
  } else {
    if( findDVDFile( dvd, filename, full_path ) )  {
      if( stat( full_path, &fileinfo ) < 0 ) {
        if(dvd->verbose >= 1) {
          fprintf( stderr, "libdvdread: Can't stat() %s.\n", filename );
        }
      } else {
        statbuf->size = fileinfo.st_size;
        statbuf->nr_parts = 1;
        statbuf->parts_size[0] = statbuf->size;
        return 0;
      }
    }
  }
  return -1;
}

/**
 * Internal, but used from dvd_udf.c 
 *
 * @param device A read handle.
 * @param lb_number Logical block number to start read from.
 * @param block_count Number of logical blocks to read.
 * @param data Pointer to buffer where read data should be stored.
 *             This buffer must be large enough to hold lb_number*2048 bytes.
 *             The pointer must be aligned to the logical block size when
 *             reading from a raw/O_DIRECT device.
 * @param encrypted 0 if no decryption shall be performed,
 *                  1 if decryption shall be performed
 * @param return Returns number of blocks read on success, negative on error
 */
int UDFReadBlocksRaw( dvd_reader_t *device, uint32_t lb_number,
                      size_t block_count, unsigned char *data, 
                      int encrypted )
{
  int ret;

  if( !device->dev ) {
    if(device->verbose >= 1) {
      fprintf( stderr, "libdvdread: Fatal error in block read.\n" );
    }
    return 0;
  }

  ret = dvdinput_seek( device->dev, (int) lb_number );
  if( ret != (int) lb_number ) {
    if(device->verbose >= 1) {
      fprintf( stderr,
               "libdvdread: UDFReadBlocksRaw: Can't seek to block %u\n",
               lb_number );
    }
    return 0;
  }

  return dvdinput_read( device->dev, (char *) data, 
                        (int) block_count, encrypted );
}

/**
 * This is using a single input and starting from 'dvd_file->lb_start' offset.
 *
 * Reads 'block_count' blocks from 'dvd_file' at block offset 'offset'
 * into the buffer located at 'data' and if 'encrypted' is set
 * descramble the data if it's encrypted.  Returning either an
 * negative error or the number of blocks read.
 *
 * @param data Pointer to buffer where read data should be placed.
 *             This buffer must be large enough to hold block_count*2048 bytes.
 *             The pointer must be aligned to 2048 bytes when reading from
 *             a raw/O_DIRECT device.
 * @return Returns the number of blocks read on success or a negative error.
 */
static int DVDReadBlocksUDF( dvd_file_t *dvd_file, uint32_t offset,
                             size_t block_count, unsigned char *data,
                             int encrypted )
{
  return UDFReadBlocksRaw( dvd_file->dvd, dvd_file->lb_start + offset,
                           block_count, data, encrypted );
}

/**
 * This is using possibly several inputs and starting from an offset of '0'.
 * data must be aligned to logical block size (2048 bytes) of the device
 * for raw/O_DIRECT devices to work
 * Reads 'block_count' blocks from 'dvd_file' at block offset 'offset'
 * into the buffer located at 'data' and if 'encrypted' is set
 * descramble the data if it's encrypted.  Returning either an
 * negative error or the number of blocks read.
 *
 * @param dvd_file A file read handle.
 * @param offset Block offset from start of file.
 * @return Returns number of blocks read on success, negative on error.
 */
static int DVDReadBlocksPath( dvd_file_t *dvd_file, unsigned int offset,
                              size_t block_count, unsigned char *data,
                              int encrypted )
{
  int i;
  int ret, ret2, off;

  ret = 0;
  ret2 = 0;
  for( i = 0; i < 9; ++i ) {
    if( !dvd_file->title_sizes[ i ] ) return 0; /* Past end of file */

    if( offset < dvd_file->title_sizes[ i ] ) {
      if( ( offset + block_count ) <= dvd_file->title_sizes[ i ] ) {
        off = dvdinput_seek( dvd_file->title_devs[ i ], (int)offset );
        if( off < 0 || off != (int)offset ) {
          if(dvd_file->dvd->verbose >= 1) {
            fprintf( stderr, "libdvdread: DVDReadBlocksPath1: Can't seek to block %d\n", 
                     offset );
          }
          return off < 0 ? off : 0;
        }
        ret = dvdinput_read( dvd_file->title_devs[ i ], data,
                             (int)block_count, encrypted );
        break;
      } else {
        size_t part1_size = dvd_file->title_sizes[ i ] - offset;
        /* FIXME: Really needs to be a while loop.
         * (This is only true if you try and read >1GB at a time) */
                
        /* Read part 1 */
        off = dvdinput_seek( dvd_file->title_devs[ i ], (int)offset );
        if( off < 0 || off != (int)offset ) {
          if(dvd_file->dvd->verbose >= 1) {
            fprintf( stderr, "libdvdread: DVDReadBlocksPath2: Can't seek to block %d\n", 
                     offset );
          }
          return off < 0 ? off : 0;
        }
        ret = dvdinput_read( dvd_file->title_devs[ i ], data,
                             (int)part1_size, encrypted );
        if( ret < 0 ) return ret;
        /* FIXME: This is wrong if i is the last file in the set. 
         * also error from this read will not show in ret. */
                
        /* Does the next part exist? If not then return now. */
        if( !dvd_file->title_devs[ i + 1 ] ) return ret;

        /* Read part 2 */
        off = dvdinput_seek( dvd_file->title_devs[ i + 1 ], 0 );
        if( off < 0 || off != 0 ) {
          if(dvd_file->dvd->verbose >= 1) {
            fprintf( stderr, "libdvdread: DVDReadBlocksPath3: Can't seek to block %d\n", 0 );
          }
          return off < 0 ? off : 0;
        }
        ret2 = dvdinput_read( dvd_file->title_devs[ i + 1 ], 
                              data + ( part1_size
                                       * (int64_t)DVD_VIDEO_LB_LEN ),
                              (int)(block_count - part1_size),
                              encrypted );
        if( ret2 < 0 ) return ret2;
        break;
      }
    } else {
      offset -= dvd_file->title_sizes[ i ];
    }
  }

  return ret + ret2;
}

/**
 * This is broken reading more than 2Gb at a time if ssize_t is 32-bit.
 */
ssize_t DVDReadBlocks( dvd_file_t *dvd_file, int offset, 
                       size_t block_count, unsigned char *data )
{
  int ret;
    
  /* Check arguments. */
  if( dvd_file == NULL || offset < 0 || data == NULL )
    return -1;
    
  /* Hack, and it will still fail for multiple opens in a threaded app ! */
  if( dvd_file->dvd->css_title != dvd_file->css_title ) {
    dvd_file->dvd->css_title = dvd_file->css_title;
    if( dvd_file->dvd->isImageFile ) {
      dvdinput_title( dvd_file->dvd->dev, (int)dvd_file->lb_start );
    } 
    /* Here each vobu has it's own dvdcss handle, so no need to update 
       else {
       dvdinput_title( dvd_file->title_devs[ 0 ], (int)dvd_file->lb_start );
       }*/
  }
    
  if( dvd_file->dvd->isImageFile ) {
    ret = DVDReadBlocksUDF( dvd_file, (uint32_t)offset, 
                            block_count, data, DVDINPUT_READ_DECRYPT );
  } else {
    ret = DVDReadBlocksPath( dvd_file, (unsigned int)offset, 
                             block_count, data, DVDINPUT_READ_DECRYPT );
  }
    
  return (ssize_t)ret;
}

int DVDFileSeek( dvd_file_t *dvd_file, int offset )
{
  /* Check arguments. */
  if( dvd_file == NULL || offset < 0 )
    return -1;
    
  if( offset > dvd_file->filesize * DVD_VIDEO_LB_LEN ) {
    return -1;
  }
  dvd_file->seek_pos = (uint32_t) offset;
  return offset;
}

#ifndef HAVE_UINTPTR_T
#warning "Assuming that (unsigned long) can hold (void *)"
typedef unsigned long uintptr_t;
#endif

#define DVD_ALIGN(ptr) (void *)((((uintptr_t)(ptr)) + (DVD_VIDEO_LB_LEN-1)) \
                                / DVD_VIDEO_LB_LEN * DVD_VIDEO_LB_LEN)

ssize_t DVDReadBytes( dvd_file_t *dvd_file, void *data, size_t byte_size )
{
  unsigned char *secbuf_start;
  unsigned char *secbuf; //must be aligned to 2048-bytes for raw/O_DIRECT
  unsigned int numsec, seek_sector, seek_byte;
  int ret;
    
  /* Check arguments. */
  if( dvd_file == NULL || data == NULL ) {
    errno = EINVAL;
    return -1;
  }
  seek_sector = dvd_file->seek_pos / DVD_VIDEO_LB_LEN;
  seek_byte   = dvd_file->seek_pos % DVD_VIDEO_LB_LEN;

  numsec = ( ( seek_byte + byte_size ) / DVD_VIDEO_LB_LEN ) +
    ( ( ( seek_byte + byte_size ) % DVD_VIDEO_LB_LEN ) ? 1 : 0 );

  /* must align to 2048 bytes if we are reading from raw/O_DIRECT */
  secbuf_start = (unsigned char *) malloc( (numsec+1) * DVD_VIDEO_LB_LEN );
  if( !secbuf_start ) {
    /* errno will be set to ENOMEM by malloc */
    return -1;
  }

  secbuf = DVD_ALIGN(secbuf_start);

  if( dvd_file->dvd->isImageFile ) {
    ret = DVDReadBlocksUDF( dvd_file, (uint32_t) seek_sector, 
                            (size_t) numsec, secbuf, DVDINPUT_NOFLAGS );
  } else {
    ret = DVDReadBlocksPath( dvd_file, seek_sector, 
                             (size_t) numsec, secbuf, DVDINPUT_NOFLAGS );
  }

  if( ret != (int) numsec ) {
    free( secbuf_start );
    return ret < 0 ? ret : 0;
  }

  memcpy( data, &(secbuf[ seek_byte ]), byte_size );
  free( secbuf_start );

  dvd_file->seek_pos += byte_size;
  return byte_size;
}

ssize_t DVDFileSize( dvd_file_t *dvd_file )
{
  /* Check arguments. */
  if( dvd_file == NULL )
    return -1;
    
  return dvd_file->filesize;
}

int DVDDiscID( dvd_reader_t *dvd, unsigned char *discid )
{
  struct md5_ctx ctx;
  int title;
  int nr_of_files = 0;
  int tmp_errno;
  int nofiles_errno = ENOENT;
  /* Check arguments. */
  if( dvd == NULL || discid == NULL ) {
    errno = EINVAL;
    return -1;
  }
  /* Go through the first 10 IFO:s, in order, 
   * and md5sum them, i.e  VIDEO_TS.IFO and VTS_0?_0.IFO */
  md5_init_ctx( &ctx );
  for( title = 0; title < 10; title++ ) {
    dvd_file_t *dvd_file = DVDOpenFile( dvd, title, DVD_READ_INFO_FILE );
    if( dvd_file != NULL ) {
      ssize_t bytes_read;
      size_t file_size = dvd_file->filesize * DVD_VIDEO_LB_LEN;
      char *buffer = malloc( file_size );

      nr_of_files++;

      if( buffer == NULL ) {
        /* errno will be set to ENOMEM by malloc */
        return -1;
      }

      bytes_read = DVDReadBytes( dvd_file, buffer, file_size );
      if( bytes_read != file_size ) {
        tmp_errno = errno;
        if(dvd->verbose >= 1) {
          fprintf( stderr, "libdvdread: DVDDiscId read returned %d bytes"
                   ", wanted %d\n", (int)bytes_read, (int)file_size );
        }
        free(buffer);
        DVDCloseFile( dvd_file );
        errno = tmp_errno;
        return -1;
      }
            
      md5_process_bytes( buffer, file_size,  &ctx );
            
      DVDCloseFile( dvd_file );
      free( buffer );
    } else {
      if(errno != ENOENT) {
        nofiles_errno = errno;
      }
    }
  }
  md5_finish_ctx( &ctx, discid );
  if(nr_of_files == 0) {
    errno = nofiles_errno;
    return -1;
  }
  return 0;
}


int DVDISOVolumeInfo( dvd_reader_t *dvd,
                      char *volid, unsigned int volid_size,
                      unsigned char *volsetid, unsigned int volsetid_size )
{
  unsigned char *buffer; /* must be aligned to 2048 for raw/O_DIRECT */
  unsigned char *buffer_start; 
  int ret;

  /* Check arguments. */
  if( dvd == NULL ) {
    errno = EINVAL;
    return -1;
  }
  
  if( dvd->dev == NULL ) {
    /* No block access, so no ISO... */
    errno = EINVAL;
    return -1;
  }
  
  buffer_start = malloc( 2 * DVD_VIDEO_LB_LEN );
  if( buffer_start == NULL ) {
    return -1;
  }

  buffer = DVD_ALIGN(buffer_start);
  
  ret = UDFReadBlocksRaw( dvd, 16, 1, buffer, 0 );
  if( ret != 1 ) {
    if(dvd->verbose >= 1) {
      fprintf( stderr, "libdvdread: DVDISOVolumeInfo, failed to "
               "read ISO9660 Primary Volume Descriptor!\n" );
    }
    free(buffer_start);
    return -1;
  }
  
  if( (volid != NULL) && (volid_size > 0) ) {
    unsigned int n;
    for(n = 0; n < 32; n++) {
      if(buffer[40+n] == 0x20) {
        break;
      }
    }
    
    if(volid_size > n+1) {
      volid_size = n+1;
    }

    memcpy(volid, &buffer[40], volid_size-1);
    volid[volid_size-1] = '\0';
  }
  
  if( (volsetid != NULL) && (volsetid_size > 0) ) {
    if(volsetid_size > 128) {
      volsetid_size = 128;
    }
    memcpy(volsetid, &buffer[190], volsetid_size);
  }
  free(buffer_start);

  return 0;
}


int DVDUDFVolumeInfo( dvd_reader_t *dvd,
                      char *volid, unsigned int volid_size,
                      unsigned char *volsetid, unsigned int volsetid_size )
{
  int ret;
  /* Check arguments. */
  if( dvd == NULL )
    return -1;
  
  if( dvd->dev == NULL ) {
    /* No block access, so no UDF VolumeSet Identifier */
    return -1;
  }
  
  if( (volid != NULL) && (volid_size > 0) ) {
    ret = UDFGetVolumeIdentifier(dvd, volid, volid_size);
    if(!ret) {
      return -1;
    }
  }
  if( (volsetid != NULL) && (volsetid_size > 0) ) {
    ret =  UDFGetVolumeSetIdentifier(dvd, volsetid, volsetid_size);
    if(!ret) {
      return -1;
    }
  }
    
  return 0;  
}